Gemini Changes

Ensuring the system responds to the rapid evolution of the GB gas market.

Part of our Change Programme, Gemini Changes ensure the system meets, exceeds and responds to the rapid evolution and demands of a modern gas market.

Scheduled Gemini Changes

There are two scheduled changes currently being implemented. All three projects are at different stages of development.

All scheduled Gemini Changes will be summarised here.

CP4376 – GB Charging and Incremental (IP PARCA)

This is a large project, with a key element being the delivery of changes from the Great Britain Charging Review.

This is a significant change to how National Grid Gas Transmission (NGGT) will receive its revenue.

The change is also likely to impact future UK Link releases.

Download the CP4376 Change Proposal from the Joint Office of Gas Transporters website.

The CP4376 project has been split into two parts - A and B.

Part A – CP4376

Part A was implemented in November 2018.

Part B – CP4376

The majority of the changes are included in Part B with the Analysis and Design phase which started in May 2018.

Full implementation is expected in September 2019. 

A number of components will be effective from 01/10/2020 and details of these can be obtained from the Gemini Projects team.

CP4550 – Gemini Re-Platform

The Gemini system is built on ageing equipment, with a 2017 health assessment recommending a new platform on new hardware.

Download the CP4550 Change Proposal from the Joint Office of Gas Transporters website.

The project will relocate the Gemini system to new equipment.

We will be working with NG to understand the:

  • key requirements for hosting the Gemini system
  • potential impacts to customers and interfacing systems

This project will be implemented after the GB Charging changes (CP4376) in 2020.

Gemini Changes Delivered

CP4368 – EU Gas Capacity Conversion Change – February and March 2018

The Capacity Allocation Mechanism (CAM) code requires a capacity conversion mechanism to be offered to Users at Interconnection Points (IPs). Modification ‘616 Capacity Conversion mechanism for Interconnection Points’, introduces this requirement to the Uniform Network Code (UNC).

The introduction of the conversion mechanism risked unfair competition. With the processing of the mechanism, shippers who were matching unbundled capacity on either side of the IP would also need to have purchased bundled capacity because of prioritisation restrictions.

To ensure fairness, the existing buyback functionality of Gemini can now be used. By using the facility and introducing a new manual process by NG, it ensures compliance with the EU obligation and a level playing field for all Users.

Download the CP4368 Change Proposal from the Joint Office of Gas Transporters website.

The change was made live on 18th February 2018.

A new Entry Method of Sale has been introduced to support the change. Two new charge types have been created on the NTS Entry invoice:

  • CEC Capacity Conversion Entry Charge
  • CEA Capacity Conversion Entry Adjustment

These charge types were effective from 1st March 2018.

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